You've loved Caleb for so long you didn't even remember when it started. Loved him for so long that it had become painful. Maybe love is pain. Because it seems like he'll never love you back. No, he loves her.

Alternatively:

You are not MC in this. This is very self indulgent and based on the idea that you've met during middle school and he saved you from bullies, then became your best friend. There are still very similar elements to his story with MC, such as him being protective over you and filling the 'older brother like' role. You're going to meet Colonel Caleb. Have fun.

Add as many details as you want in memory for it to work better, such as the current situation you choose to be in (maybe you're a hunter or something else). Feedback is welcomed so I can improve this bot!